EP2603809A1 - Location of mobile network nodes - Google Patents
Location of mobile network nodesInfo
- Publication number
- EP2603809A1 EP2603809A1 EP11749632.3A EP11749632A EP2603809A1 EP 2603809 A1 EP2603809 A1 EP 2603809A1 EP 11749632 A EP11749632 A EP 11749632A EP 2603809 A1 EP2603809 A1 EP 2603809A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- node
- sent
- unknown
- reply
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 claims description 13
- 238000004891 communication Methods 0.000 description 6
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0284—Relative positioning
- G01S5/0289—Relative positioning of multiple transceivers, e.g. in ad hoc networks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/14—Determining absolute distances from a plurality of spaced points of known location
Definitions
- the invention relates generally to wireless networks, and more specifically in one embodiment to locating mobile wireless mesh network nodes.
- Bluetooth technology that enables a cell phone user to associate and use an earpiece in what is sometimes referred to a personal area network or PAN.
- PAN personal area network
- Another example is a mesh network, in which a number of devices work together to form a mesh, such that data can be sent from a source device to a destination device via other devices in the mesh network.
- Mesh networks often include multiple links from a network node to other network nodes nearby, and can thereby provide routing around broken links or paths by discovering other routes through the mesh to a destination node.
- New nodes to a mesh network are typically able to automatically discover the mesh network when they are activated in the vicinity of a compatible mesh network, and can easily join the network.
- Mesh networks are often made up of network nodes that are not mobile, and so link quality and reliability is relatively slow to change. Most applications of mesh networks rely on radio frequency communications to transfer data between network nodes, as running cables between nodes defeats somewhat the intended ease of installation and use of mesh network devices.
- Mesh network device installations often have multiple networks deployed in remote locations, and are managed from a central location or server.
- the central location computer might have knowledge of what devices are within each of the mesh networks under management, but typically does not have direct access to the network nodes or knowledge of the location of each node in the network.
- a mesh network controller might monitor an array of network nodes attached to various tools or production equipment in a facility and know the location of some fixed nodes in the facility, but will not know the location of other, mobile nodes in the network.
- One example embodiment of the invention comprises determining the physical position of a movable node in a wireless network by sending a first sent WiFi signal from one of an unknown node and a first reference node having a known location, and repeating the sent WiFi signal in the other of the unknown node and first reference node with a first reply WiFi signal.
- a distance is derived between the unknown node and the first reference node from the time of flight of the first sent and first reply WiFi signals.
- a second WiFi signal is sent from one of the unknown node and a second fixed node having a known location, and repeating the sent second WiFi signal in the other of the unknown node and second reference node with a second reply WiFi signal, and A distance is derived between the unknown node and the second reference node from the time of flight of the second sent and second reply WiFi signals.
- a physical location of the unknown node is determined based on the derived distances between the unknown node and the first and second reference nodes.
- Figure 1 shows a wireless network, as may be used to practice some embodiments of the invention.
- Figure 2 shows a wireless network, as may be used to practice some embodiments of the invention.
- Figure 3 shows a variety of equations as may be used to practice some embodiments of the invention.
- Figure 4 shows a flowchart of determining an unknown node's physical position using repeater nodes, consistent with an example embodiment of the invention.
- mesh networks are often used to route data between various elements or nodes in a network made up of a number of loosely assembled nodes.
- Mesh networks are designed such that a compatible node can easily join the network and receive and send data, including passing received data long a route to an intended destination node.
- Mesh networks are therefore considered self-arranging and self-healing, in that if a node becomes inoperable or loses a connection to another node, data can be easily routed around the broken network link.
- mesh network technologies use wireless communication, further enhancing the ease of use of mesh networking for certain applications. Because deployed mesh network nodes are typically stationary for some period of time, wireless connections between various nodes can be formed and characterized by searching a known frequency or radio band for other mesh network nodes as new wireless nodes are added to the mesh network. Recent reductions in cost and advancement in wireless networking technology has made use of mesh networking for a variety of applications a desirable alternative to using a more structured network such as a TCP/IP network or other type of network.
- ZigBee mesh network One example of a mesh network standard using wireless radio communication is the ZigBee mesh network, which was developed by an industry alliance and is related to IEEE standards including 802.15.4.
- Other wireless networks include 802.11 standards such as a, b, g, and n, more commonly known as WiFi, used for wireless computer networks.
- Distance between nodes is often estimated using relative signal strengths of signals from multiple nodes having known locations to estimate the position of the unknown node, using the radio modems in a WiFi, ZigBee, or DigiMesh network.
- signals can be attenuated or amplified by presence of metal objects in the area, such as in a warehouse environment, making such position determination using signal strength suspect.
- mesh networks are often used in monitoring or tracking applications where the physical location of a node is important, it is often desirable to be able to determine the physical position of a new or mobile node in such a wireless network environment.
- Some solutions to network node position determination include using GPS (Global Positioning System) receivers in the nodes, such that the GPS receiver can provide the node with its location. This significantly raises the cost and complexity of the node, as a GPS receiver must then be added to each such node, and the node must be able to receive strong enough GPS signals to make a position determination.
- GPS Global Positioning System
- Other systems use a common timebase and methods of triangulation or trilateration, but require a significant number of messages be passed from the mobile node to determine time of flight to at least three other nodes with known positions.
- a WiFi radio operable on multiple bands such as an 802.11 a/b/g WiFi radio or a a/g/n WiFi radio, is in a further example operated as a repeater having substantially no turnaround time or a low fixed turnaround time, such that it is operable to receive a signal on a first frequency or channel and immediately resend a signal on another frequency or channel.
- Widespread adoption of WiFi integrated circuits have made repeating a received signal on another channel relatively practical and inexpensive, enabling more practical implementation of many embodiments described herein.
- time of flight can be calculated and used to compute the distance between a first node and the repeater node, enabling ranging between nodes and determination of the position of an unknown node using multiple nodes of known location.
- Figure 1 shows an example wireless network, as may be used to practice an example embodiment of the invention.
- Fixed nodes Nl and N2 have known locations, and a third node N3 has an unknown location.
- the unknown node N3 initiates a location process, such as to report its physical position to another node on the network for asset tracking.
- Unknown node N3 sends a message to node Nl on a first channel or band, such as an 802.1 la, b, or g WiFi channel, or the 2.4GHz or 5 GHz wireless bands for 802.11(n).
- Node NTs wireless radio is operable to receive on one channel or frequency and to transmit on another channel or frequency simultaneously, and so is said to be capable of duplex operation.
- Node Nl receives the incoming signal, and nearly instantaneously resends the received signal or another suitable responsive signal back to unknown node N3 using the other channel or frequency.
- node N3 can compute the distance to node Nl based on the time taken to receive a reply signal without having to compensate for a turnaround time in node Nl, denoted as Dl in Figure 1.
- Node N3 repeats this distance-finding method with fixed node N2 and calculates the distance D2 separating nodes N3 and N2.
- Node N3 has therefore determined its distance to two nodes having fixed, known locations, and in some embodiments may have sufficient information to locate the unknown node N3.
- N3 down to points along a circle having its center along the line connecting nodes Nl and N2, such that the distance Dl is maintained between nodes N3 and Nl and distance D2 is maintained between node N3 and N2.
- further location information is desired to more accurately pinpoint the location of the unknown node N3.
- the location of node N3 can be determined to be at one of two locations denoted by N3 and (N3) in Figure 1.
- nodes Nl and N2 are at one end of the possible location space, such as along a wall of the factory or facility, enables the node N3 to conclude that it is likely on a known side of the wall and therefore at location N3 rather than (N3).
- a third known node N4 is used as shown in Figure 1.
- This additional distance information d3 can be used to ensure that the node is at location N3 rather than at location (N3) within the plane of a factory floor or other relatively flat physical node space. It can also be used to determine the location of unknown node N3 in three dimensions, where it is known which side of the plane formed by Nl, N2, and N4 the unknown node N3 will be found.
- node N3 such as where the unknown nodes are all on the ground floor of a multi-level facility, or all on the roof of the facility so that the unknown node will be in a known direction from the plane formed by the three known nodes.
- a fourth known node is used as is shown in Figure 2.
- An unknown node N5 can then determine its distance to each of the four nodes N1-N4, finding its location within three dimensions.
- the turnaround time in the nodes is considered trivial in the above example, factors such as turnaround time and time taken to initiate transmission or reception may be large enough in some embodiments to result in a slight inaccuracy in the distances determined between nodes. Because these processing times will be similar for all fixed nodes in the system, the location of the unknown node can be determined with greater accuracy by simply subtracting an estimated turnaround time from the distances calculated, or by subtracting the same distances from dl, d2, and d3, until the best convergence of the three distances is obtained.
- Figure 3 shows various equations illustrating determination of distance based on propagation time for various embodiments of the invention.
- the basic principle is illustrated at 301, which illustrates that distance covered by a radio signal is equal to velocity multiplied by time of travel. Because the velocity of radio waves is a known constant, and the time of travel is measured by the known or unknown nodes, the distance between the nodes can be calculated.
- the distance between two nodes as shown at 302 is the propagation velocity multiplied by the time taken to travel one way plus the propagation velocity multiplied by the time taken to travel back, minus the propagation velocity times the time taken to turn around.
- This can be simplified as shown at 303 to the velocity times the total time of flight divided by two, minus any turnaround time or other delay or processing time.
- the turnaround time is dropped, and the distance is reflected by equation 304 which shows the distance between two nodes and the product of the velocity of propagation multiplied by the total time of flight, divided by two.
- Turnaround time is in some embodiments designed to be a fraction of the anticipated time of flight of the sent and reply signals, such as 1/10, 1/20, 1/50, 1/100, 1/500, 1/1000, or some other such fraction of the time of flight.
- FIG. 4 is a flowchart illustrating an example method of finding such an unknown node.
- a networked computerized system initiates a node location process, attempting to physically locate a node having an unknown location such as N3 of Figure 1.
- the location of three reference nodes Nl, N2, and N4 are known, and this knowledge is used along with derived distance information to determine the location of the unknown node.
- the first reference node Nl sends a message to the unknown node, which sends a reply message on another channel or frequency to the node Nl as soon as the incoming message is received.
- the time of flight is then used to derive the distance between reference node Nl and unknown N3 at 402, such as by using the methods described in conjunction with Figures 1-3.
- the distance between reference node N2 and the unknown node N3 is determined at 403, and the distance between reference node N4 and unknown node N3 is determined at 404.
- This information is used to determine the location of the unknown node N3 at 405, by finding the two points in space at which the unknown node's distance to the three reference nodes matches the distances determined in steps 402-404.
- a greater or fewer number of reference node distances may be derived to locate the unknown node, depending on the spatial configuration of the known and unknown nodes.
- a radio operable to receive and send on different channels or frequencies can be used to provide very fast turnaround of a received signal when operating in a duplex mode.
- a repeater forwards messages received on one channel to be immediately transmitted on another channel with no processing, effectively making turnaround time insignificant relative to time of flight. This enables relatively easy calculation of the distance between two nodes based on time of flight, at relatively low cost using standard radios such as WiFi band radios, allowing the network to derive the position of an unknown node through its known distances to reference nodes of known position.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/853,714 US8576818B2 (en) | 2010-08-10 | 2010-08-10 | Location of mobile network nodes |
PCT/US2011/047240 WO2012021610A1 (en) | 2010-08-10 | 2011-08-10 | Location of mobile network nodes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2603809A1 true EP2603809A1 (en) | 2013-06-19 |
EP2603809B1 EP2603809B1 (en) | 2014-12-17 |
Family
ID=44533162
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11749632.3A Active EP2603809B1 (en) | 2010-08-10 | 2011-08-10 | Location of mobile network nodes |
Country Status (3)
Country | Link |
---|---|
US (1) | US8576818B2 (en) |
EP (1) | EP2603809B1 (en) |
WO (1) | WO2012021610A1 (en) |
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US8825011B2 (en) * | 2008-12-19 | 2014-09-02 | Tecore, Inc. | Intelligent network access control |
US20130081541A1 (en) | 2011-10-03 | 2013-04-04 | Erik John Hasenoehrl | Air freshening network |
WO2014008622A1 (en) * | 2012-07-09 | 2014-01-16 | Intel Corporation | Improved trilateration processing |
US20140022917A1 (en) * | 2012-07-17 | 2014-01-23 | Procter And Gamble, Inc. | Home network of connected consumer devices |
US10165654B2 (en) | 2012-07-17 | 2018-12-25 | The Procter & Gamble Company | Home network of connected consumer devices |
US8886785B2 (en) | 2012-07-17 | 2014-11-11 | The Procter & Gamble Company | Home network of connected consumer devices |
US9762437B2 (en) | 2012-07-17 | 2017-09-12 | The Procter & Gamble Company | Systems and methods for networking consumer devices |
EP3126997A4 (en) * | 2014-03-31 | 2017-08-30 | Kountable, Inc. | Multi-variable assessment systems and methods that evaluate and predict entrepreneurial behavior |
US10122711B2 (en) | 2014-03-31 | 2018-11-06 | Kountable, Inc. | Secure communications methods for use with entrepreneurial prediction systems and methods |
CN108352912B (en) * | 2015-11-09 | 2020-07-07 | 智加系统公司 | Method for synchronizing a plurality of devices and determining a position based on synchronized devices |
US9791540B2 (en) | 2015-12-14 | 2017-10-17 | Google Inc. | Self-organizing hybrid indoor location system |
US10455350B2 (en) | 2016-07-10 | 2019-10-22 | ZaiNar, Inc. | Method and system for radiolocation asset tracking via a mesh network |
US11609300B2 (en) | 2017-03-17 | 2023-03-21 | SIRL, Inc. | Precise positioning system enabled product location method |
US11606667B2 (en) | 2017-03-17 | 2023-03-14 | WangsLabs, LLC | Precise positioning system and method of using the same |
US10802104B2 (en) * | 2018-12-26 | 2020-10-13 | Locix, Inc. | Systems and methods for using ranging and triangulation to determine locations of wireless sensor nodes based on radio frequency communications between the nodes and various RF-enabled devices |
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AUPQ504100A0 (en) * | 2000-01-11 | 2000-02-03 | Notron (No. 325) Pty Limited | A method for distribution of streamed data packets on a switched network utilising an intelligent distribution network |
US5918024A (en) * | 1996-05-08 | 1999-06-29 | Ericsson, Inc. | Method and apparatus for providing single channel communications |
US20060267841A1 (en) | 2003-01-02 | 2006-11-30 | Lee Chong U | Position determination with peer-to-peer communication |
US7286624B2 (en) | 2003-07-03 | 2007-10-23 | Navcom Technology Inc. | Two-way RF ranging system and method for local positioning |
US7026992B1 (en) | 2005-03-31 | 2006-04-11 | Deere & Company | Method for configuring a local positioning system |
US8700105B2 (en) * | 2006-06-22 | 2014-04-15 | Qualcomm Incorporated | Low duty cycle device protocol |
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JP4932546B2 (en) * | 2007-03-07 | 2012-05-16 | 日本電気株式会社 | Communication node, network system having the communication node, and data transmission method |
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US8515448B2 (en) * | 2008-10-07 | 2013-08-20 | Nokia Corporation | Upload and download of position reference data |
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US8514697B2 (en) * | 2010-01-08 | 2013-08-20 | Sycamore Networks, Inc. | Mobile broadband packet switched traffic optimization |
-
2010
- 2010-08-10 US US12/853,714 patent/US8576818B2/en active Active
-
2011
- 2011-08-10 EP EP11749632.3A patent/EP2603809B1/en active Active
- 2011-08-10 WO PCT/US2011/047240 patent/WO2012021610A1/en active Application Filing
Non-Patent Citations (1)
Title |
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See references of WO2012021610A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2012021610A1 (en) | 2012-02-16 |
US20120039310A1 (en) | 2012-02-16 |
EP2603809B1 (en) | 2014-12-17 |
US8576818B2 (en) | 2013-11-05 |
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